So recently, Lead Systems Designer Greg "Ghostcrawler" Street posted a new Dev Watercooler discussing the ins and outs of the new active mitigation tank philosophy. Since he dedicated a whole section to proposed death knight changes in patch 4.3, I figured it would be a good idea to take a look at the stuff and see what it does.
My preliminary verdict would be pretty simple: It's a pretty big help. It fixes or mitigates a lot of our quality of life issues, it makes a little less squishy, and it nullifies rune tetris nicely. I can't really disagree with the individual changes or the rationale behind them. That said, it doesn't completely solve our problems, and there are probably one or two more little things to be done before stuff looks really good. Let's take a look at the specifics.